Portable battery charger



FIG. 1 is a 3/4 view of a portable battery charger showing the new design;

FIG. 2 is a right side view of the portable battery charger shown in FIG. 1;

FIG. 3 is a left side view of the portable battery charger shown in FIG. 1;

FIG. 4 is a top view of the portable battery charger shown in FIG. 1;

FIG. 5 is a bottom view of the portable battery charger shown in FIG. 1;

FIG. 6 is a front view of the portable battery charger shown in FIG. 1; and,

FIG. 7 is a back view of the portable battery charger shown in FIG. 1. 

CLAIM What is claimed is the ornamental design for portable battery charger, as shown and described herein. 